Hydraulic tool



March 13, 1962 R. G. STEIN HYDRAULIC TOOL Filed March 5, 1958 F I G. I.

/2 k H: "mu m I I /4 a g MI 1 Q mnmlm /4 ;1 FIG.5. 56 49 3 3 i l||| /0 l l 64 36 i I il 39 60- ,5 ,i /4 23 53 .6. 2 E Iv /6 FIG 6 I i I I ,I l 6/ 53A! 6 I 'll 20 33 INVENTOR. l9 l9 RUSSELL G. STEIN M, MV/m United States atent 3,024,524 Patented Mar. 13, 1962 3,024,524 HYDRAULIC TOOL Russell G. Stein, 1324 Mackinac Ave., South Milwaukee, Wis, assignor of one-half to Robert N. Dude, South Milwaukee, Wis.

Filed Mar. 5, 1958, Ser. No. 719,262 1 Claim. (Cl. 29-252) The present invention relates to tools of the type used for pulling gears, wheels, bearings, pulleys or the like, and which find particular utility in vehicle repair work.

In pulling or removing a part, for example, a bearing assembly from its shaft, it is important to apply pressure evenly around the bearing in order that it will not bind or be distorted. A force of several tons is applied with these pulling tools and the part being removed sometimes will shatter and fly about; or if the tool is not properly aligned, it will kick out with considerable force.

Another problem in work of this type is that the part to be removed may be so located so as to be inaccessible to the conventional pulling tool.

In accordance with the present invention a pressure applying tool has been provided which has a quick acting coupling collar that also functions to prevent injury to the operator in the event the part being removed breaks during the removal process.

The tool provided by this invention also insures an evenly distributed force on the part being removed.

The invention furthermore prow'des a pressure applying tool having attaching parts and coupling collars that result in a highly versatile and eflicient tool.

These and other objects and advantages of the invention will appear later as this disclosure progresses, reference being had to the accompanying drawings, in which:

FIGURE 1 is a longitudinal cross sectional view through a pulling tool made in accordance with the present invention and showing its application for removal of a bearing assembly from a vehicle axle;

FIGURES 2 and 3 are sectional views taken on lines 22 and 3-3 respectively of FIGURE 1 and showing the quick attaching connection for the coupling collar halves;

FIGURE 4 is a perspective view of a modified form of a quick acting coupling collar;

FIGURE 5 is a longitudinal cross sectional view of another form of pulling tool made in accordance with the invention, and

FIGURE 6 is a longitudinal cross sectional view of still another type of pulling tool.

Referring more specifically to the drawings, the hydraulic ram 10 comprises a cylinder 11 having a pressure fluid supply conduit 12, a rod 13 extendable from the cylinder, and an annular shoulder or projection 14.

As illustrated in FIGURE 1 the invention has been shown as used for removing a bearing assembly 16 from a vehicle drive axle 17 which would be secured to the vehicle housing 18 by bolt means 19 extending through its flange 20. The removal of these hearings from trucks or automobiles is ordinarily a particularly difi'lcult job, often requiring on the order of one hour to accomplish. For this particular task, the present invention provides a pulling tube 21 having radially outward extending flanges 22 and 23 at its ends.

A Sp1ittype coupling collar 25 is used to connect the one end of tube 21 to the ram 10 and includes the complementary halves 26, 27 which are hinged together at 28 and have a quick acting latch 29 at their other side to hold them together. The collar has axially spaced radially extending flanges 3G, 31 which embrace the tube flange 22 and ram shoulder 14, respectively.

Another quick attachable coupling collar 33 secures V the tube in pulling relationship to the bearing assembly 16 or other part to be removed. In addition, this collar 33 acts to completely enclose the hearing so that if the latter shatters or breaks while pressure is applied thereto, the parts will not fly about to cause injury and other damage. The collar 33 has an inner flange 34 containing an aperture 35 through which the axle 17 extends. This flange is adapted to abut against the inner side of bearing 16 while flange 36 engages the tube flange 23. This collar 33 is also formed of complementary halves 37, 38 hinged together at 39 and having a quick acting latch 40. The inner portion of the collar 33 is provided with a series of different sizes of steps or annular shoulders 52, 53 which accommodate the various sizes of retaining rings of certain types of vehicles. By providing a firm bearing surface that extends completely around the ring, distortion or bending of the parts is prevented.

The above arrangement is such that as pressure fluid is admitted to the ram, the rod is forced to extend relative thereto and applies a force to the axle. An oppositely directed force is applied to the bearing by the ram cylinder acting through collar 25, tube 21 and collar 33. By use of collars 25 and 33 and tube 2 1, an evenly distributed force is applied around the bearing. In other words, rather than using circurnferentially spaced grasping fingers which create a circumferentially unbalanced force that results in binding or tipping between the parts, the present arrangement provides an evenly and circumferentially distributed load. In fact, the arrangement shown is balanced to such an extent that it is possible to remove a bearing from a completely broken axle, by piecing the axle together in the tube 21 for transmitting the force of the ram.

The modified form of collar 42, shown in FIGURE 4, is comprised of complementary halves 43, 44 which are held together by a ring 45 slipped axially over the halves, When the latter are together, and serves to tightly embrace them to prevent their disassembly. The collar 43 otherwise performs as do collars 25 or 33.

The arrangement shown in FIGURE 5 shows the ram 10 employing another coupling collar 47 and an adapter plate 48 as used when removing a vibration damper pulley 49 from a truck crankshaft 50. The pulley 49 is mounted closely adjacent the crankshaft housing 51 and there is insufficient clearance therebetween for the insertion of a coupling collar. The pulling plate 48 is secured to the pulley by bolts 52 which are threaded into tapped holes in the pulley. The plate '48 has a groove 53 extending around its periphery and a central opening 54 for receiving the pulley hub 55. The inner flange 56 of the collar 47 extends into groove 53 while the outer flange 57 abuts against ram shoulder 14. The collar 47 is also of the split type and its halves are slipped over the pulley and ram and securely locked together. By means of this collar 47 and plate 48 and effective coupling means is provided for this particular job.

FIGURE 6 shows another coupling collar 60 having a radially short flange 61 which engages a gear 62 to be pulled from shaft 63. Flange 64 of the collar bears against shoulder 14 of the ram and the rod 13 pushes against the end of the shaft 63 when pressure fluid is admitted to the ram. Collar 60 is also of the split halves type by means of which it is readily clamped in position or removed.

Various modes of carrying out the invention are contemplated as being within the scope of the following claim particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.

I claim:

A tool for pulling a part from a shaft comprising in combination, a hydraulic ram having an annular proection extending around its exterior periphery, said ram ncluding a force applying element disposed coaxially with and extending in a direction normal to said annular projection, a pulling tube adapted to be slipped over said ihaft and element and having a radial outwardly ex- :ending flange at each of its ends, a coupling collar having 1 pair of radially inwardly extending flanges embracing )ne of said tube flanges and said ram projection thereaetween, a second coupling collar having a pair of radi- References Cited in the file of this patent ally inwardly extending flanges embracing the other of 10 2,504,393

:aid tube flanges and adapted to embrace said part there- )etween, said second coupling collar adapted to enclose :aid part and apply pressure from said ram through said vube and equally around said shaft.

UNITED STATES PATENTS Fessenden Nov. 2, 1920 Kerr Sept. 7, 1926 Schwerin June 3, 1930 Odlum May 10, 1932 Jorgenson Feb. 28, 1939 Grant Jan. 31, 1950 Cook Apr. 18, 1950 FOREIGN PATENTS France June 3, 1930 

